Question

How the get sizeof struct in C

Answer 1

#include <stdio.h>
#include <stdlib.h>

int main(void) {

    typedef struct {
        char *p;
        char ch;
    } st1;

    typedef struct {
        char *p;
        char ch;
        long i;
    } st2;

    typedef struct {
        char *p;
        char ch;
        long long i;
    } st3;

    typedef struct {
        char *p;
        char ch;
        char arr[5];
    } st4;

    printf("sizeof st1 = %u\n", sizeof(st1));
    printf("sizeof st2 = %u\n", sizeof(st2));
    printf("sizeof st3 = %u\n", sizeof(st3));
    printf("sizeof st4 = %u\n", sizeof(st4));

    return(0);
}





/*
run:

sizeof st1 = 8
sizeof st2 = 12
sizeof st3 = 16
sizeof st4 = 12

*/

 

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